고분자 전해질 연료전지 금속 분리판용 금속의 염화물 농도에 따른 전기화학적 특성 연구
Investigation on Electrochemical Characteristics of Metallic Bipolar Plates with Chloride Concentrations for PEMFC
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Currently, the demand for eco-friendly energy sources is high, which has prompted research on polymer electrolytemembrane fuel cells. Both aluminum alloys and nickel alloys, which are commonly considered as materials of bipolarplates in fuel cells, oxide layers formed on the metal surface have excellent corrosion resistance. In this research,the electrochemical characteristics of 6061-T6 aluminum alloy and Inconel 600 were investigated with chloride concentrationsin an acid environment that simulated the cathode condition of the PEMFC. After potentiodynamic polarizationexperiments, Tafel analysis and surface analysis were performed. Inconel 600 presented remarkably goodcorrosion resistance under all test conditions. The corrosion current density of 6061-T6 aluminum alloy was significantlyhigher than that of Inconel 600 under all test conditions. Also, 6061-T6 aluminum alloy and Inconel 600 presenteduniform corrosion and intergranular corrosion, respectively. The Ni, Cr, and Fe, which are the main chemicalcompositions of Inconel 600, are higher than Al in the electromotive force series. And a double oxide film of NiOCr2O3, which is more stable than Al2O3, is formed. Thus, the corrosion resistance of Inconel 600 is better.
Abstract
Currently, the demand for eco-friendly energy sources is high, which has prompted research on polymer electrolytemembrane fuel cells. Both aluminum alloys and nickel alloys, which are commonly considered as materials of bipolarplates in fuel cells, oxide layers formed on the metal surface have excellent corrosion resistance. In this research,the electrochemical characteristics of 6061-T6 aluminum alloy and Inconel 600 were investigated with chloride concentrationsin an acid environment that simulated the cathode condition of the PEMFC. After potentiodynamic polarizationexperiments, Tafel analysis and surface analysis were performed. Inconel 600 presented remarkably goodcorrosion resistance under all test conditions. The corrosion current density of 6061-T6 aluminum alloy was significantlyhigher than that of Inconel 600 under all test conditions. Also, 6061-T6 aluminum alloy and Inconel 600 presenteduniform corrosion and intergranular corrosion, respectively. The Ni, Cr, and Fe, which are the main chemicalcompositions of Inconel 600, are higher than Al in the electromotive force series. And a double oxide film of NiOCr2O3, which is more stable than Al2O3, is formed. Thus, the corrosion resistance of Inconel 600 is better.
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